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          <section id="how-to-think-in-javet">
<h1>How to Think in Javet?<a class="headerlink" href="#how-to-think-in-javet" title="Link to this heading">#</a></h1>
<p>There are folks migrating projects from other libraries (e.g. J2V8) to Javet. Some experienced certain challenges which from Javet perspective required <strong>Thinking in Javet</strong>. So, how?</p>
<section id="v8runtime-and-v8valueglobalobject">
<h2>V8Runtime and V8ValueGlobalObject<a class="headerlink" href="#v8runtime-and-v8valueglobalobject" title="Link to this heading">#</a></h2>
<p>In Javet, <code class="docutils literal notranslate"><span class="pre">V8Runtime</span></code> and <code class="docutils literal notranslate"><span class="pre">V8ValueGlobalObject</span></code> are separate concepts.</p>
<section id="v8runtime">
<h3>V8Runtime<a class="headerlink" href="#v8runtime" title="Link to this heading">#</a></h3>
<p><code class="docutils literal notranslate"><span class="pre">V8Runtime</span></code> is only a representative of the V8 isolate and V8 context. It has nothing to do with <code class="docutils literal notranslate"><span class="pre">globalThis</span></code> or <code class="docutils literal notranslate"><span class="pre">window</span></code>. However, in few other libraries these concepts are mixed up.</p>
</section>
<section id="v8valueglobalobject">
<h3>V8ValueGlobalObject<a class="headerlink" href="#v8valueglobalobject" title="Link to this heading">#</a></h3>
<p>As <code class="docutils literal notranslate"><span class="pre">V8Runtime</span></code> no longer represents <code class="docutils literal notranslate"><span class="pre">globalThis</span></code> or <code class="docutils literal notranslate"><span class="pre">window</span></code>, <code class="docutils literal notranslate"><span class="pre">V8ValueGlobalObject</span></code> from <code class="docutils literal notranslate"><span class="pre">V8Runtime.getGlobalObject()</span></code> is the one.</p>
<p>If you want to access global objects or call top level functions, <code class="docutils literal notranslate"><span class="pre">globalObject.get('...')</span></code> and <code class="docutils literal notranslate"><span class="pre">globalObject.invoke('...')</span></code> are the Javet ways.</p>
</section>
</section>
<section id="executor-and-execute">
<h2>Executor and Execute<a class="headerlink" href="#executor-and-execute" title="Link to this heading">#</a></h2>
<p>In Javet, executing a script involves 2 steps.</p>
<ol class="arabic simple">
<li><p>Get an executor.</p></li>
<li><p>Call certain execute method of that executor.</p></li>
</ol>
<p>This is quite different from the common practice of few other libraries where execute is just a 1-step thing.</p>
<p>Why? Javet intends to offer a builder pattern in the script execution. With an executor, application may do every other things before the actual execution. For instance: security check, enable / disable certain V8 features, hack the AST, set up interception, etc. The scope may be limited to that executor only. Also, the executor can be reused to avoid the duplicated resource loading overhead.</p>
</section>
<section id="declarative-function-and-property-interception">
<h2>Declarative Function and Property Interception<a class="headerlink" href="#declarative-function-and-property-interception" title="Link to this heading">#</a></h2>
<p>Javet offers an easy way of registering function and property interception in a declarative way. Just decorate a function of arbitrary object with <code class="docutils literal notranslate"><span class="pre">&#64;V8Function(name</span> <span class="pre">=</span> <span class="pre">&quot;...&quot;)</span></code> or <code class="docutils literal notranslate"><span class="pre">&#64;V8Property(name</span> <span class="pre">=</span> <span class="pre">&quot;...&quot;)</span></code>, Javet is able to register it and that function will be called back from V8. Application is free from managing those tedious things like resource leakage, object lifecycle, type conversion, etc. Javet just handles that behind the scene and everything goes smoothly.</p>
<p>The coding experience is a little bit close to working with Spring Framework.</p>
</section>
<section id="learn-from-unit-test">
<h2>Learn from Unit Test<a class="headerlink" href="#learn-from-unit-test" title="Link to this heading">#</a></h2>
<p>Most of the Javet API is unit test covered. Learning from Javet unit test is an express and effective way to Thinking in Javet.</p>
</section>
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            <ul>
<li><a class="reference internal" href="#">How to Think in Javet?</a><ul>
<li><a class="reference internal" href="#v8runtime-and-v8valueglobalobject">V8Runtime and V8ValueGlobalObject</a><ul>
<li><a class="reference internal" href="#v8runtime">V8Runtime</a></li>
<li><a class="reference internal" href="#v8valueglobalobject">V8ValueGlobalObject</a></li>
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<li><a class="reference internal" href="#executor-and-execute">Executor and Execute</a></li>
<li><a class="reference internal" href="#declarative-function-and-property-interception">Declarative Function and Property Interception</a></li>
<li><a class="reference internal" href="#learn-from-unit-test">Learn from Unit Test</a></li>
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